Use nf_conntrack headers instead of ip_conntrack ones and add sanitized versions.
diff --git a/extensions/libipt_NETMAP.c b/extensions/libipt_NETMAP.c
index 8cecb4d..4b4b14d 100644
--- a/extensions/libipt_NETMAP.c
+++ b/extensions/libipt_NETMAP.c
@@ -9,7 +9,7 @@
 #include <getopt.h>
 #include <iptables.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter/nf_nat.h>
 
 #define MODULENAME "NETMAP"